Merge the dictionary pack in Latin IME.

Bug: 8161354
Change-Id: I17c23f56dd3bc2f27726556bf2c5a9d5520bd172

1 files changed, 141 insertions, 0 deletions

diff --git a/java/src/com/android/inputmethod/dictionarypack/MetadataHandler.java b/java/src/com/android/inputmethod/dictionarypack/MetadataHandler.java
new file mode 100644
index 000000000..a0147b6d6
--- /dev/null
+++ b/java/src/com/android/inputmethod/dictionarypack/MetadataHandler.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2011 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package com.android.inputmethod.dictionarypack;
+
+import android.content.Context;
+import android.database.Cursor;
+
+import java.io.IOException;
+import java.io.InputStreamReader;
+import java.util.Collections;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Helper class to easy up manipulation of dictionary pack metadata.
+ */
+public class MetadataHandler {
+    @SuppressWarnings("unused")
+    private static final String TAG = "DictionaryProvider:" + MetadataHandler.class.getSimpleName();
+
+    // The canonical file name for metadata. This is not the name of a real file on the
+    // device, but a symbolic name used in the database and in metadata handling. It is never
+    // tested against, only used for human-readability as the file name for the metadata.
+    public final static String METADATA_FILENAME = "metadata.json";
+
+    /**
+     * Reads the data from the cursor and store it in metadata objects.
+     * @param results the cursor to read data from.
+     * @return the constructed list of wordlist metadata.
+     */
+    private static List<WordListMetadata> makeMetadataObject(final Cursor results) {
+        final ArrayList<WordListMetadata> buildingMetadata = new ArrayList<WordListMetadata>();
+
+        if (results.moveToFirst()) {
+            final int localeColumn = results.getColumnIndex(MetadataDbHelper.LOCALE_COLUMN);
+            final int typeColumn = results.getColumnIndex(MetadataDbHelper.TYPE_COLUMN);
+            final int descriptionColumn =
+                    results.getColumnIndex(MetadataDbHelper.DESCRIPTION_COLUMN);
+            final int idIndex = results.getColumnIndex(MetadataDbHelper.WORDLISTID_COLUMN);
+            final int updateIndex = results.getColumnIndex(MetadataDbHelper.DATE_COLUMN);
+            final int fileSizeIndex = results.getColumnIndex(MetadataDbHelper.FILESIZE_COLUMN);
+            final int checksumIndex = results.getColumnIndex(MetadataDbHelper.CHECKSUM_COLUMN);
+            final int localFilenameIndex =
+                    results.getColumnIndex(MetadataDbHelper.LOCAL_FILENAME_COLUMN);
+            final int remoteFilenameIndex =
+                    results.getColumnIndex(MetadataDbHelper.REMOTE_FILENAME_COLUMN);
+            final int versionIndex = results.getColumnIndex(MetadataDbHelper.VERSION_COLUMN);
+            final int formatVersionIndex =
+                    results.getColumnIndex(MetadataDbHelper.FORMATVERSION_COLUMN);
+
+            do {
+                buildingMetadata.add(new WordListMetadata(results.getString(idIndex),
+                        results.getInt(typeColumn),
+                        results.getString(descriptionColumn),
+                        results.getLong(updateIndex),
+                        results.getLong(fileSizeIndex),
+                        results.getString(checksumIndex),
+                        results.getString(localFilenameIndex),
+                        results.getString(remoteFilenameIndex),
+                        results.getInt(versionIndex),
+                        results.getInt(formatVersionIndex),
+                        0, results.getString(localeColumn)));
+            } while (results.moveToNext());
+
+            results.close();
+        }
+        return Collections.unmodifiableList(buildingMetadata);
+    }
+
+    /**
+     * Gets the whole metadata, for installed and not installed dictionaries.
+     * @param context The context to open files over.
+     * @param clientId the client id for retrieving the database. null for default (deprecated)
+     * @return The current metadata.
+     */
+    public static List<WordListMetadata> getCurrentMetadata(final Context context,
+            final String clientId) {
+        // If clientId is null, we get a cursor on the default database (see
+        // MetadataDbHelper#getInstance() for more on this)
+        final Cursor results = MetadataDbHelper.queryCurrentMetadata(context, clientId);
+        final List<WordListMetadata> resultList = makeMetadataObject(results);
+        results.close();
+        return resultList;
+    }
+
+    /**
+     * Read metadata from a stream.
+     * @param input The stream to read from.
+     * @return The read metadata.
+     * @throws IOException if the input stream cannot be read
+     * @throws BadFormatException if the stream is not in a known format
+     */
+    public static List<WordListMetadata> readMetadata(final InputStreamReader input)
+            throws IOException, BadFormatException {
+        return MetadataParser.parseMetadata(input);
+    }
+
+    /**
+     * Finds a single WordListMetadata inside a whole metadata chunk.
+     *
+     * Searches through the whole passed metadata for the first WordListMetadata associated
+     * with the passed ID. If several metadata chunks with the same id are found, it will
+     * always return the one with the bigger FormatVersion that is less or equal than the
+     * maximum supported format version (as listed in UpdateHandler).
+     * This will NEVER return the metadata with a FormatVersion bigger than what is supported,
+     * even if it is the only word list with this ID.
+     *
+     * @param metadata the metadata to search into.
+     * @param id the word list ID of the metadata to find.
+     * @return the associated metadata, or null if not found.
+     */
+    public static WordListMetadata findWordListById(final List<WordListMetadata> metadata,
+            final String id) {
+        WordListMetadata bestWordList = null;
+        int bestFormatVersion = Integer.MIN_VALUE; // To be sure we can't be inadvertently smaller
+        for (WordListMetadata wordList : metadata) {
+            if (id.equals(wordList.mId)
+                    && wordList.mFormatVersion <= UpdateHandler.MAXIMUM_SUPPORTED_FORMAT_VERSION
+                    && wordList.mFormatVersion > bestFormatVersion) {
+                bestWordList = wordList;
+                bestFormatVersion = wordList.mFormatVersion;
+            }
+        }
+        // If we didn't find any match we'll return null.
+        return bestWordList;
+    }
+}